he could 3bet bluff easily. And gives such good odds when he is OOP, so easy call.

Flop I guess is ok. I could raise maybe to get calls from weaker aces and draws. Not sure what is better.

Now the sizing gets much bigger than on flop, so not sure what to put him on. I had top 2 pair, so called. But maybe my 2 pair is not good anymore hen he bets that big.
He could still have AQ so we split. But with AJ, AK on the turn he should not bet that big. Flopped sets and 2 pairs might bet on flop biggget instead of turn. Or can they bet flop small and once they see me calling, they expect me to have Ax hand so now bet bigger?

River - if he has AJ - its good for me. Then he has AK also. J probably does not change much - if I am beat, I am beat already on the turn.

Preflop: Call seems fine, 4bet is also an option. I don't like 4bet/fold so you would need to 4bet/call. That play isn't profitable if you are not 4bet bluffing a lot and he is not 5betting a very wide range.

Assuming you have a tighter image, calling is the best play.

Postflop: I don't see any other play than to call down. I don't think raising at any point in time makes sense. You also have the Ace of spade, which blocks off possible flush combos from his range.

I dont think u should read too much into betsizing. Assuming the river wasnt a jack, i think we should call down with aq by default unless we had good reads that he never bluffs the river. Aj would be a fold though.